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Titolo:
Temperature effect on spreading of perfluoropolyethers on amorphous carbonfilms
Autore:
Ma, XD; Tang, H; Gui, J;
Indirizzi:
Seagate Recording Media, Fremont, CA 94538 USA Seagate Recording Media Fremont CA USA 94538 Media, Fremont, CA 94538 USA
Titolo Testata:
TRIBOLOGY LETTERS
fascicolo: 4, volume: 10, anno: 2001,
pagine: 203 - 209
SICI:
1023-8883(200105)10:4<203:TEOSOP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHAIN-LIKE MOLECULES; PERFLUOROPOLYALKYLETHER FILMS; SURFACES;
Keywords:
surface diffusion; spreading; temperature effect; activation energy; PFPE; scanning micro-ellipsometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Ma, XD Seagate Recording Media, 47010 Kato Rd, Fremont, CA 94538 USA Seagate Recording Media 47010 Kato Rd Fremont CA USA 94538 4538 USA
Citazione:
X.D. Ma et al., "Temperature effect on spreading of perfluoropolyethers on amorphous carbonfilms", TRIBOL LETT, 10(4), 2001, pp. 203-209

Abstract

The temperature effect on the spreading behavior of Fomblin Zdol and Z on amorphous carbon surfaces has been studied by scanning micro-ellipsometry, The temperature range explored in this study spans from 26 to 56 degreesC under 0% relative humidity. The results show that while temperature in general accelerates surface diffusion, it has little effect on the surface conformation of the lubricants. The diffusion coefficient versus film thickness maintains the same shape, only the overall amplitude increases with increasing temperature. The activation energy E-a is found to be relatively insensitive to the lubricant coverage up to one monolayer. The average activationenergy is around 37 kJ/mol for Zdol (M-n = 2500 g/mol), and around 21 kJ/mol for Z of the same molecular weight. With increasing molecular weight theactivation energy increases but the rate of increase is very moderate. More interestingly, the activation energy Versus molecular weight curves for Zdol and Z are nearly parallel to each other, suggesting that the interactions between the main-chain and the carbon surface are essentially independent of the interactions between the end-groups and the carbon surface.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 12:57:45